Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Polymer Physics III

CPP 32.4: Vortrag

Donnerstag, 26. März 2009, 10:15–10:30, ZEU 222

Modelling agglomeration effects in CNT/polymer composites — •Marina Saphiannikova, Sven Richter, and Gert Heinrich — Leibniz-Institute für Polymerforschung, Hohe str. 6, 01069 Dresden

Theoretical description of viscoelastic properties of the polymer melts, filled with attractively interacting anisometric particles, represents a great challenge. Such filler particles tend to build a network-like superstructure [1] which is very fragile and can be easily broken in external flow fields. In the quiescent state the particles agglomerate again, slowly restoring the network superstructure. In this study, to describe the agglomeration/deagglomeration process of anisometric particles, we use a superposition approach, in which the total stress is represented by a sum of three stresses: 1) the viscoelastic stress arising in the polymer matrix, 2) the hydrodynamic reinforcement due to the presence of anisometric particles, 3) the viscoelastic stress arising in the filler network. The latter is represented by a nonlinear variant of the Maxwell model combined with a usual kinetic equation for the scalar structural parameter that describes the instantaneous state of filler network at particular flow conditions. This approach is verified in a number of linear and nonlinear shear experiments carried out on polycarbonate composites filled with carbon nanotubes [2].

This work was supported by the BMBF grant CarboNet No.03X0504E.

[1] F.R.Costa et al. Adv. Polym. Sci. 210, 101 (2008) [2] S.Richter et al. Submitted to Macromol. Symp., Macromolecules